<p>Fields Medalists (institution at time of award)</p>
<p>Princeton University 5
Institute for Advanced Study, Princeton 5
Harvard University 4
University of Cambridge, UK 4
UC Berkeley 2
MIT 2
University of Oxford, UK 2
Moscow State University 2
Stanford University 1</p>
<p>Harvard’s medalists include Lars Ahlfors, Heisuke Hironaka, David Mumford, and Curtis McMullen. Shing-Tung Yau won the medal while at the Institute for Advanced Study but subsequently moved to Harvard about 15 years ago. Ed Witten was a physics professor at Harvard but did not get tenured and moved to Institute for Advanced Study, where he became a huge star and also won the Fields medal. There are probably other winners who were at Harvard at various stages of their math careers.</p>